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The Mg/Ca–temperature relationship in brachiopod shells: Calibrating a potential palaeoseasonality proxy

Butler, Scott ORCID:, Bailey, Trevor, Lear, Caroline Helen ORCID:, Curry, Gordon, Cherns, Lesley ORCID: and McDonald, Iain ORCID: 2015. The Mg/Ca–temperature relationship in brachiopod shells: Calibrating a potential palaeoseasonality proxy. Chemical Geology 397 , pp. 106-117. 10.1016/j.chemgeo.2015.01.009

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Brachiopods are long-lived, long-ranging, extant organisms, of which some groups precipitate a relatively diagenetically stable low magnesium calcite shell. Previous work has suggested that the incorporation of Mg into brachiopod calcite may be controlled by temperature (Brand et al., 2013). Here we build upon this work by using laser ablation sampling to de␣ne the intra-shell variations in two modern brachiopod species, Terebratulina retusa (Linnaeus, 1758) and Liothyrella neozelanica (Thomson, 1918). We studied three T. retusa shells collected live from the Firth of Lorne, Scotland, which witnessed annual temperature variations on the order of 7 °C, in addition to four L. neozelanica shells, which were dredged from a water depth transect (168–1488 m) off the north coast of New Zealand. The comparison of intra-shell Mg/Ca profiles with shell ad18O confirms a temperature control on brachiopod Mg/Ca and supports the use of brachiopod Mg/Ca as a palaeoseasonality indicator. Our preliminary temperature calibrations are Mg/Ca = 1.76 ± 0.27 e(0.16 ± 0.03)T, R2 = 0.75, for T. retusa and Mg/Ca = 0.49 ± 1.27 e(0.2 ± 0.11)T, R2 = 0.32, for L. neozelanica (errors are 95% confidence intervals).

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Subjects: Q Science > QE Geology
Publisher: Elsevier
ISSN: 0009-2541
Funders: NERC
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 18 January 2015
Last Modified: 11 Nov 2023 18:10

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